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Monday, May 17, 2010

BP Intercepts Some Flow; Disastrous Gulf Oil Spill Continues

BP Intercepts Some Flow; Disastrous Gulf Oil Spill Continues - May 17: In a release and additional information, BP provided an update on developments in the response to the MC252 oil well incident in the Gulf of Mexico. BP indicates that s

ubsea efforts continue to focus on progressing options to stop the flow of oil from the well through interventions via the blow out preventer (BOP), and to collect the flow of oil from the leak points. The efforts are being carried out in conjunction with governmental authorities and other industry experts.

The riser insertion tube tool (RITT) containment system was put into place in the end of the leaking riser on May 16. Operations began during the day to allow oil and gas to flow through the tool up to the drillship Discoverer Enterprise on the surface 5,000 feet above. Produced oil, estimated currently at 1,000 barrels per day, is being stored on the drillship while produced gas is being flared. It is expected that it will take some time to increase the flow through the system and maximize the proportion of oil and gas flowing through the broken riser that will be captured and transported to the drillship. It should be noted that, BP and government agencies are still using the figure of 5,000 barrels per day as the rate of the leak; however, other reputable sources are estimating far more (i.e. between 20,000 to 100,000 barrels per day).

The RITT is a fabricated from 4-inch diameter pipe, fashioned to allow one end to be inserted into the broken riser pipe that is the source of the main oil flow from the MC252 well, and the other to be connected to a drill pipe and riser from the Discoverer Enterprise. The RITT allows the injection of methanol to mitigate against the formation of gas hydrates.This remains a new technology and both its continued operation and its effectiveness in capturing the oil and gas remains uncertain. Other containment options continue to be progressed.

BP indicates it also continues to develop options to shut off the flow of oil from the well through interventions via the well's failed BOP. Plans continue to be developed for a so called "top kill" operation where heavy drilling fluids are injected into the well to stem the flow of oil and gas, followed by cement to seal the well. Options have also been developed to potentially combine this with so-called "junk shot", the injection under pressure of a variety of materials into the BOP to seal off upward flow. Plans for deployment of these options are being progressed with the possibility of deployment in the next week or so. Work on the first relief well, which began on May 2, continues. The DDII drilling rig began drilling the second relief well on May 16. Each of these wells is estimated to take some three months to complete from the commencement of drilling.

BP reports that surface response work continues to collect and disperse oil that has reached the surface of the sea. Over 650 vessels are involved in the response effort, including skimmers, tugs, barges and recovery vessels. Intensive operations to skim oil from the surface of the water have now recovered, in total, some 151,000 barrels (6.3 million gallons) of oily liquid. The total length of boom deployed as part of efforts to prevent oil reaching the coast is now almost 1.7 million feet, including over 400,000 feet of sorbent boom. In total over 19,000 personnel from BP, other companies and government agencies are currently involved in the response to the incident. BP said that so far 15,000 claims have been filed and 2,600 have already been paid. BP has also received almost 60,000 calls into its help lines.

Meanwhile concerns have been raised about reports of a large subsurface mass of oil. NOAA Administrator Jane Lubchenco issued a statement on the ongoing efforts to monitor subsea impacts of the BP Oil Spill and said, "Media reports related to the research work conducted aboard the R/V Pelican included information that was misleading, premature and, in some cases, inaccurate. Yesterday the independent scientists clarified three important points: (1) No definitive conclusions have been reached by this research team about the composition of the undersea layers they discovered. Characterization of these layers will require analysis of samples and calibration of key instruments. The hypothesis that the layers consist of oil remains to be verified.

"(2) While oxygen levels detected in the layers were somewhat below normal, they are not low enough to be a source of concern at this time. (3) Although their initial interest in searching for subsurface oil was motivated by consideration of subsurface use of dispersants, there is no information to connect use of dispersants to the subsurface layers they discovered. NOAA thanks the Pelican scientists and crew for repurposing their previously scheduled mission to gather information about possible impacts of the BP oil spill. We eagerly await results from their analyses and share with them the goal of disseminating accurate information.

"NOAA continues to work closely with EPA and the federal response team to monitor the presence of oil and the use of surface and sub-surface dispersants. As we have emphasized, dispersants are not a silver bullet. They are used to move us towards the lesser of two environmental outcomes. Until the flow of oil is stemmed, we must take every responsible action to reduce the impact of the oil."

Also today, U.S. EPA and the U.S. Coast Guard announced they have authorized BP to use dispersants underwater, at the source of the Deepwater Horizon leak. The agencies said oil spill dispersants are chemicals that attempt to break down the oil into small drops and prevent it from reaching the surface or the U.S. shoreline. The agencies said, "Dispersants are generally less harmful than the highly toxic oil leaking from the source and they biodegrade in a much shorter time span. The use of the dispersant at the source of the leak represents a novel approach to addressing the significant environmental threat posed by the spill. Preliminary testing results indicate that subsea use of the dispersant is effective at reducing the amount of oil from reaching the surface  and can do so with the use of less dispersant than is needed when the oil does reach the surface. This is an important step to reduce the potential for damage from oil reaching fragile wetlands and coastal areas."

Access the latest BP update release (click here). Access a fact sheet on the RITT (click here). Access the statement from the NOAA Administrator (click here). Access the Committee on Homeland Security website for links to all testimony and a webcast (click here). Access a release from EPA & the Coast Guard with links to additional information (click here).